Re: [PATCH v2 0/2] Make it possible to reserve memory on 64bit platform

[Dan Williams]

On Sat, Jan 16, 2021 at 2:43 AM Wesley Zhao <zhaowei1102@xxxxxxxxxxxxxxx> wrote:
>
> I was trying to reserve some memory to save logs incase that Android panic or hang and then
> I can read the logs from QNX side from the memory reserved before on the Qualcomm 8155 hypervisor platform,
> and I find the "reserve=" parameter only support 32bit,so I made some change and send these patches.

See Documentation/admin-guide/kernel-parameters.txt

        memmap=nn[KMG]$ss[KMG]
                        [KNL,ACPI] Mark specific memory as reserved.
                        Region of memory to be reserved is from ss to ss+nn.
                        Example: Exclude memory from 0x18690000-0x1869ffff
                                 memmap=64K$0x18690000
                                 or
                                 memmap=0x10000$0x18690000
                        Some bootloaders may need an escape character
before '$',
                        like Grub2, otherwise '$' and the following number
                        will be eaten.